<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var arr =[
            {name:["css","html"]},
            {age:[18,19]}
        ]
        //["html",18,19]
        var res = []
        arr.forEach(item=>{
            for(k in item){
                res.push(...item[k])
            }
            
        })
        var index = res.indexOf("css")
            res.splice(index,1)
            console.log(res)
    </script>
</body>
</html>